icE1usb fw: Use 'int' as the default type for port index

No benefit to use uint8_t and for consistency with later patches,
use 'int' here too.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: I50a76476af844acf20436b9d410cb917b723590d
2 files changed